Append "Group: " string to select option menu on BP homepage

[r-a-y]

When you're logged in, on the BP homepage, you have the "What's new" block, which allows you to post to your profile and other groups.

In the select option menu, for groups, I'd recommend adding the string "Group: " so users are aware of the groups they have access to.

To borrow a page from Erich, I've attached a screenshot!

[haloid]

This is a duplicate of ​http://trac.buddypress.org/ticket/1549.